Printing sulfurized dyestuffs.



onirnn srmfru iiiifl OFF MAX CiltUNliAUM, OF BERNE, SWITZERLAND,ASSIGNOR TO THE FIRM. OF SOCIETY- CHEMICAL INDUSTRY IN BASLE, OF BASEL,SWITZERLANI).

PRINTING SULFURIZEID DYES'I'UFFS.-

Specification of Letters Patent.

Patented Got. 20, 1968.

Application flied December 2, 1907. fieriallto. QOMitfi.

To all whom it may concern:

lie it known that 1, MAX GR'UNBAUM, chemist, a subject of the Emperor ofRussia, and resident of Berne, Switzerland, have invented new and usefulImprovements in. lrinting Sulfurized Dyestulls,of which the following isa full, clear, and exact specification.

' The general application of sulfurized dyestu'lls in printing hashitherto been dilficult owing to the fact that it has been impossible toavoid the blackening of the brass or copper printing rollers by thesulfurized dyestull's. Frequent propositions have been made forobviating this blackening, but without satisfactory result and with theadded dilliculty due to the necessity involved by all of them for usingdyestuil's specially purified, that is to say devoid of tree sulfur andalkali sulfid.

The present invention, by which blacked ing of the brass or copperrollers is prevented in a highly simple manner and which allows the useof dycstufl's containing sulfur or alkali sulfid, is based on the nowand surprising observation that concentrated solutions of crystallizedsodium suliid, as well as solutions of sodium suliid strongly alkalinewith caustic alkali do not blacke'n copper or brass. For instance, acopper plate remains bright for a long time in a solution of 50 parts ofcrystallized sodium sulfid in 50 parts of water, or in a solutionconsisting of (30 grams of crystallized sodium suliid, 80 c. c. ofcaustic soda lye oi 40 llaum specific gravity and l liter of water. Thepractical result of this observation is that printing. colors which willnot blacken brass or co ppcr I rollers can easily be made fromsulfurizcd dyestull's by ridding to'thc printing paste a concentratedsodium siilfid solution with. or without a strong caustic allcaliire'thici tening a id, so far as dyestull's containing polysuliids areconcerned, mixing the hot printing color with sodium hydrosulfiteinorglcr to destroy the said polysulfids. v

The invention is illustrated by the following examples:

Example I. IOparts of pyrogencyanin L, 80 parts of crystiillized sodiumsulfid, 80 .arts of water, 30 ports of British gum, are oiled togetherfor}; hour; after cooling, the paste is printechbrass rollers beingused, the

printed goods are dried, then steamed for 2-3 minutes in thel'vluthcr-llatt apparatus,

rinsed and scoped.

Exam le ll. 50 grains of pyrogen yellow OR are mated to boiling" with200 grams of sodium suliid. solution (1 part of crystallized sodiumsullid and 1. part of water) and 700 grams of alkaline thickening(consisting of 200 grams of British gum, 700 grains oi ceustic soda lyeof 40 liaumc spocilic gravity and E00 grains oi kaolin), 1- hour, whilestirring; 50 grains of sodium hydrosulfite of rollers, before washingthem with pure watcr, to wash them first with dilute caustic soda lyc orwith a strong caustic alkali solu tion oi sodium sullid. The printedgoods are well dried and ilwurinscd and soapcd either directly alterdrying, or after treatment in 30 the Mathcnlf'latt apparatus lor 23minutes at 100 102? c.

Example lll. 100 grains of pyrog'cn black G, 4-00 grams oi sodium sullidsolution (1.21),

420 grams of alkaline thickening of the composition given in Example ll,are boiled together 3, hour, 80 grams ol' hydrosullite are added, theheating is continued for 5 minutes and the whole is cooledv Printing andlinishing are as before, but it may he noted that in printing' blacksulfurizcd dycstuil's brass rollers are best;

Example IV. 50 grams of pyrogon dark grccn B, 20d grams of sodium sullidsolution (1:1 700 grains of alkaline thickening, are

boiled ior 1- hour, 50 grams oi" hydrosuliitc are added, heating iscontinued for 5 minutes and the mass is coolcd and printed. The printedgoods are well dried and directly washed and soapcd without previoussteaminc. In analogous manner printing colors may be )TO Jared fromother sulfurizcd dyestuils, oi' whatever shade and composition, lorinstance, from pyroc'cn g1-een, l)yrogen blue, pyrogcn brown, thiophenolb eck, as

well as from the sulfurizcd dyestuffs known it is to be observed, how-70 under the names immedial, katigen and thiogen dyestuffs.

What I claim is:

1. The herein described improved process for printing sulfurizeddyestuffs, which consists in first preparing a rintin color whichcontains an excess of so ium su fid at such a high degree ofconcentration thatbrass or copper is not attacked thereby, and thenprinting the same by means of rollers containing co per, whereb suchprinting may be efl'ecte without blac ening of said rollers.

2. The herein describedimproved process for printing sulfurizeddyestufl's, which consists in first preparing a printing colorwhiohcontains causticalkali andan excess of so dium sulfid at such a highdegree of concentration that brass or copper is not attacked thereby,and then printing the same by means of rollers containing copper,whereby such printing may be effected without blackening of saidrollers.

3. The herein described improved process MAX GRUNBAUM.

Witnesses AMAND BITTER, AMAND BRAUN.

